After slogging through the hostile masses, spy the sky bridge further ahead. The bridge begins to crumble. Run across the unstable bridge, fighting for your life and side-stepping holes, to a pavilion crowded with more enemies. Wring the room for all it's worth for extra Bolts and such goodies from the crates before leaving to grind another set of rails.

This time, however, you will be grinding against oncoming trains. Leap out of the way to one of the other rails to avoid nasty collisions, but you will want to stay on the center one to arrive safely at the end. Ride a few more Meteor Pads and slaughter all those who dare to oppose you. Keep moving as the ground beneath Ratchet begins to give way, causing him to dive right into traffic. Use the Sixaxis to steer Ratchet to safety by actually tilting the entire controller, although a few bumps won't necessarily kill (leaves big bruises though).

Finally arriving at the Defense Center, Ratchet tries to contact Captain Qwark through the intercom but to no avail. Instead, the duo ends up fleeing from the area grind-style with a pair of hovercrafts hot on their tail. Jump to the other rail to avoid the searing lasers. After narrowly avoiding a gruesome death by train and lasers, leap to the far right rail to continue the grind until a giant warship joins the high-speed chase. Its lasers shoot out from three different cannons, and you can predict which of the cannons is about to unleash one when the tip of it glows bright yellow. Flip to another rail to get safely out of the way.